Something simple re: a new partition under lvm.

[Bill Case]

Hi;

There used to be a gui for lvm commands.  It seems to have disappeared.
I have browsed the man pages.  It seems to involve more risk and
learning than I want at the moment.

What I want to do is simple.  I have a freshly installed Fedor 19 on a
500 Gig drive.  Anaconda install lvm. I want to add a partition were I
can safely store my routine backups.  I would think that 50 Gig would be
more than enough room.  I am used to using parted, or gparted, but
parted doesn't configure lvm, I understand.  (The more I read the less
sure I am of that,)

Were on the drive is the best place to put such a partition.  I suspect
it doesn't matter.  The last 50 gigs seems appropriate.  So under lvm
how do I reconfigure my drive to have this extra partition.
-- 
Regards William Case,
Fedora 19, Gnome 3.8.4,
Evo 3.8.5, Emacs 24x.

[Bill Case]

On Mon, 2013-08-19 at 20:15 -0500, Javier Perez wrote:
>  I think there are some conceptual issues that you should understand
>  and I do not feel you are clear on them yet. (Or maybe I am the one
>  not clear)
>  
>  First of all, there is no "last 50Gb" on a LLV scheme. When you create
>  and use LLV, you are surrendering disk management to the LLV manager
>  in exchange of the flexibility it provides handling the disk. Whatever
>  data you send to the LLV volume, the manager will place where it feels
>  most convenient. 
>  Second, if you want a 50G "partition" you need to create a second
>  volume group to hold those backups, separate from the main volume.
>  Again, there is no guarantee of where in the disk this data would
>  reside unless you first created a 50GB partition at the end of the
>  drive, and created a volume in there with vgcreate and added it to the
>  physical volume, but geese, that sounds like all the work we were
>  originally trying to avoid :-) 
>  Finally, are you taking into consideration that whatever managed to
>  trash your filesystem under LLV will most likely trash your backups if
>  they are under the same LLV structure?
>  
>  My 2 cents
>  
>  On Aug 19, 2013 4:03 PM, "Alasdair G Kergon" <agk(a)redhat.com&gt; wrote:
>          On Mon, Aug 19, 2013 at 10:59:46PM +0200, Mateusz Marzantowicz
>          wrote:
>          > pvscan, pvscreate, vgscan, vgcreate, lvscan, lvcreate
>          
>          These days, vgcreate followed by lvcreate is sufficient.
>          
>          - vgcreate automatically performs pvcreate if it needs to
>          - scans shouldn't normally be needed
>          
>          Alasdair
>          
>          --
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I fully admit that I don't understand most of lvm and have considered it
a nuisance for my home system.  Ten years ago I spent a great deal of
time learning about partitioning and became quite familiar with parted
and friends.  Now at seventy years of age I carefully pick my study
projects.  LVM was not on the list. 

It turns out I didn't need lvm lessons.  I booted onto my old disk and
Fedora 16, fired up gparted, found that this time anaconda had not
arbitrarily installed LVM; from parted I added my back up partition with
out a hitch.  

I apologize for disturbing you guys with a non-problem.
-- 
Regards William Case,
Fedora 19, Gnome 3.8.4,
Evo 3.8.5, Emacs 24x.

[Javier Perez]

I think there are some conceptual issues that you should understand and I
do not feel you are clear on them yet. (Or maybe I am the one not clear)

First of all, there is no "last 50Gb" on a LLV scheme. When you create and
use LLV, you are surrendering disk management to the LLV manager in
exchange of the flexibility it provides handling the disk. Whatever data
you send to the LLV volume, the manager will place where it feels most
convenient.
Second, if you want a 50G "partition" you need to create a second volume
group to hold those backups, separate from the main volume. Again, there is
no guarantee of where in the disk this data would reside unless you first
created a 50GB partition at the end of the drive, and created a volume in
there with vgcreate and added it to the physical volume, but geese, that
sounds like all the work we were originally trying to avoid :-)
Finally, are you taking into consideration that whatever managed to trash
your filesystem under LLV will most likely trash your backups if they are
under the same LLV structure?

My 2 cents
On Aug 19, 2013 4:03 PM, "Alasdair G Kergon" <agk(a)redhat.com&gt; wrote:

>  On Mon, Aug 19, 2013 at 10:59:46PM +0200, Mateusz Marzantowicz
> wrote:
>  > pvscan, pvscreate, vgscan, vgcreate, lvscan, lvcreate
>
>  These days, vgcreate followed by lvcreate is sufficient.
>
>  - vgcreate automatically performs pvcreate if it needs to
>  - scans shouldn't normally be needed
>
>  Alasdair
>
>  --
>  users mailing list
>  users(a)lists.fedoraproject.org
>  To unsubscribe or change subscription options:
>  https://admin.fedoraproject.org/mailman/listinfo/users
>  Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
>  Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
>  Have a question? Ask away: http://ask.fedoraproject.org
>

[Alasdair G. Kergon]

On Mon, Aug 19, 2013 at 10:59:46PM +0200, Mateusz Marzantowicz wrote:
>  pvscan, pvscreate, vgscan, vgcreate, lvscan, lvcreate 
 
These days, vgcreate followed by lvcreate is sufficient.

- vgcreate automatically performs pvcreate if it needs to
- scans shouldn't normally be needed

Alasdair

[Mateusz Marzantowicz]

On 19.08.2013 22:34, Bill Case wrote:
>  Hi;
>  
>  There used to be a gui for lvm commands.  It seems to have disappeared.
>  I have browsed the man pages.  It seems to involve more risk and
>  learning than I want at the moment.
>  
>  What I want to do is simple.  I have a freshly installed Fedor 19 on a
>  500 Gig drive.  Anaconda install lvm. I want to add a partition were I
>  can safely store my routine backups.  I would think that 50 Gig would be
>  more than enough room.  I am used to using parted, or gparted, but
>  parted doesn't configure lvm, I understand.  (The more I read the less
>  sure I am of that,)
>  
>  Were on the drive is the best place to put such a partition.  I suspect
>  it doesn't matter.  The last 50 gigs seems appropriate.  So under lvm
>  how do I reconfigure my drive to have this extra partition.
>   
pvscan, pvscreate, vgscan, vgcreate, lvscan, lvcreate


Mateusz Marzantowicz